Ore-milling machine



1.1. CRANMER. ORE MIILLING MACHINE.

APPLICATION FILED NOV. 26, I919.

1,391,301,, PatentedSept. 20,1921.

2 SHEETS-SHEET I.

INVENTOR John J? L'ranmer .1. J. CRANMER.

ORE MILLING MACHINE APPLICATION FILED NOV. 26, 1919.-

1 1,391,301. 'PatentedSept. 20,1921.

2 SHEETS-SHEET 2.

INYENTOR ,7 '0 all whom it may concern .7

U TE STATES PATENTS oFFIcE;

JOHN: J; {cimmrtna or PINE enovnf CALIFORNIA, AssrGNoa OF ONE-FOUBTHJ To 'LEE rAYToN, or PINE GROVE, 'roALIFoRNIe, {A'Nn onn-ronn'rn 'ro JOSEPH w.

I PRESTON, .13.; or SAN FRANCISCO, CALIFORNIA, i

ORE-MILLING irnc ninn.

Be it known that I, JoHN J. CRANMER, a Citizen of the United States, residing at Pine Grove, in the county of Amador and State of California, have invented new and useful Improvements in Ore-Milling Machines, of which the following is a specification. 1

This invention relates to anore milling machine and particularly'to-a machine in which a grinding and stamping action is obtained. One-of the objects of the present invention is to provide a simplesubstantial ore millingmachine in which both a grinding and stamping action is employedlfor the reduction of ore; also a mill which'will reduce the orein the best. possiblecondition for treatment by a concentration, cyaniding or amalgamation and-which is designed to amalgamate theicoarse as well'as, thefine gold-inside the mill and withoutfiouring.-

Another object of the inventionfi'sfto provide an impact action and wash of the water employed whlch w1ll=1nsure immediate d1scharge of the ore on reaching the necessary degree of fineness and-return the "oversize under the mullers thereby preventing isliming and. unnecessary regrinding of the ore. i U

i nother object of the-invention is to provide a mill which is so constructed that all partsjsubject'to wear, such as the grinding dies, sh0es,"etc. may be .readilyremoved and replaced when worn.

Further object will'hereinafter appear. The' invention consists of the parts'and the construction, combination 1 and arrangement of parts as willbehereinafter-Ignore fully describedand 'claimed, having reference to the accompanying drawings," in

Figure lis a central, vertical, section of the mill.

Fig. 2 is a plan view of the rotor and the mullers propelled thereby.

Fig. 3 is a side elevation, partly in section,

of one of the mullers.

Referring to the drawings in detail and particularly Fig. 1, Aindicatesa baseframe in which is centrally positioned and journaled a vertically disposed driving shaft 2 to which power is transmitted in any suitable manner or as here shown by means of gears 3. Secured on the up er end of the shaft is a rotor 4: andpivota 1y mounted in Applicatifon filed- November 26, 1919. Serial No; 340,703.

Specification of Letters e atente sepe zo, 1921,

therotor as. at 5 are a'plu rality of radially disposed-armsfi. Journaled on the free end of each arm is a muller 7 i and forming a trackway and support for the mullers isan annular bottom die 8 which'is secured in an manner and itima'ybe built in sectionsif'de sired to permit ready removal or replacement ofthe same when worn. Formed on each 'sidejof the annular die 8 is an annular groove. 10, the function of which will hereinafter be described. Formed on theouter edge of the base frame is an annular screen frame 11 and suitably secured in said frame are a series of screens 12.

" The ore to be ground r reduced is this instance del-ivered'to a central hopper 12'v supportedby the rotor 4, and it is in turn distributed. to the mullers7by means of radially disposed downwardly extending pipes 13 which terminate'in frontflof the mullers. The ore is-in this manner delivered to themullers as fast as they can reduce. the same and the ore is discharged throughthe'screens12 on reaching the necessary degree of fineness. i

-' "The-most important feature of present that each muller is provided with a series of I earn shaped shoes 14:, said shoes being so positioned that they. slightly overlap each other duces a combined grinding and stamping action duringthe rotation of the mullers.

*inventionfis the construction'of the mullers I ,By referr ngto Figs. 2 and 3, it will be-seen as at/15 and .eachsho'e' being provided'with 1 an inwardly extending lug 16 through which is passed a securing bolt or pin-17'. The shoes taper from "end to'end, all being heaviestat the lug'end-and the thinnest at'the) The shoes are in this instance shown as re- 7 movable to permit renewal of the same when worn, but I wish it understood that the'ofi' set cam faces produced by the shoes maybe formed directly in the face of the muller if desired. In actual operation with power transmitted to shaft 2, it can readily be seen simultaneously travel around and around on the annular bottom die .8. Ore delivered by means of the hopper 12" and the pipes13- willthus be deposited 'in'front of the respec-.,

tive mullers and will thereby be crushed due to the grinding and stamping action pro: duced; that is, the off-set cam faces formed by the shoes 14 will permit each muller to drop when grinding over the heavy endof each shoe, thereby producing a stamping -returns.the' oversized to the mullers. An-

other important feature of the-presentinvention is the provision of the annular grooves 10. These serve the function of amalgam traps and thereby prevent, the escape of qui k or amalgam' which; might otherwise flour and pass through the screens. Perfect amalgamation both ofcoarse and fine gold can therefore take placedirectly within the mill, and an ample quantity ofquicksi'lver may be I employed as the danger of loss by fiouring ..is practicallyprevented, 'Sliming of theme is also reduced to a minimum as the wash action produced by the dropv and, rotary movement of the mullers immediately recapacity and-general efiiciency; Q While a more or less specific design moves the fines themome'nt-they have been reduced to'such a size that :theymay" escape through theiscreens. A large screens'urface is also provided thereby insuring increased of mill is here shown,-,I wish it understood that the invention may be appliedtoypracticalL any standard form of mill. I the'reforewlsh it understood that changes in design and proportion may be .resortedto; similarly, that i the materials and finish oflthe several parts employed can be such as the experience and judgment of the manufacturermay dictate I and varyingconditions may demand.

I Having thus'des'cribed my invention, what I Indesire to secure by, Letters Patent is': I

1., In an o're milling machine, aimuller, a plurality 'ofshoes secured on the outer face of' the muller, said shoes being cam shaped and presenting a high and a low end, means permitting overlapping of the shoes to permit the formation of a continuouscovering on themuller, a pluralityof recesses formed in the face .of the muller, and a securing lug on each shoe adapted to be received thereby. 2. In an ore milling machine, a muller, a

plurality of shoes secured on'the outer face of the muller, said shoes' being cam-shaped and presenting a high and a lowend, a recess formed in the high end of each shoe for the reception of the rear low end of the'shoe disposed in'front thereof, and a single securing means for each shoe. Q

I 3. In an ore milling-machine, a muller, a plurality of shoes securedon the outer face of the muller, said shoes being cam sh'aped and presenting a high. andalowend, .a recess formed in the high end of each shoe for the reception of the rear low endof the shoe disposed in front thereof, a plurality of recesses formed in the outer surface of" the muller,,a.

lug oneach shoefadapted to be received by said recesses, and-'means for securing the lugsa'ndgsho'es againstrremoval with relation to the recesses. g-

4. Inan ore milling machine, a muller, a plurality of curved cam-shaped shoes on the outer face of the muller, the forward high .end: of each shoe partially overlappino the rear low end of the shoe disposed in front thereof tosecurethe rear end of each shoe "and'tozform a' continuous covering for the muller, a lug formed on the inner end of each shoe adjacent the forward overlapping end,

a plurality of recesses in the outer face of the muller forthe reception of the respective lugs, and means carried by; the muller extending through the recesses and the secure the same against removal.

- In. testimony whereofI'havehereunt'o presence of two Subscribing my hand 'in the witnesses. T I JOHN J. 'CRANMER.J= Witnesses:

" GRACE R. MEssmR, V

HOMER MESSIER."

lugs to 

